The organ of the Church of S. Anna is a valuable record of the nineteenth century organ school of Toscana (Tuscany).
It was built in 1852 by Nicomede Agati of Pistoia who, with his brothers, was able to develop in a proto-industrial way a high level artisan activity initiated by Pietro Agati (1735-1806). The Agati distinguished for the extraordinary quality of materials and processing, reaching also fascinating results in intonation.
Witness is the organ placed in the church S. Anna, which, although small in size, represents an ideal model of "organ engineering" using many technical steps to expand the variation of sounds.
The keyboard has 50 keys and chromatic range of C1-F5 with division Bassi-Soprani at F3-F#3. The pedalboard, with range of C1-E2, has 17 pedals, lectern-shaped with 12 real notes. The registers are driven by levers placed in two columns to the right of the keyboard with the following order:
|First Column||Second Coloumn||Pedaletti|
|right of the keyboard||right of the keyboard||over the pedalboard|
|Terza mano||Principale bassi||Distacco pedale|
|Corno inglese soprani||Principale soprani||Cornetto soprani|
|Cornetto chinese||Ottava bassi||Trombe basse|
|Voce angelica soprani||Ottava soprani||Trombe soprani|
|Flauto in ottava bassi||XV||Fagioletto|
|Flauto in ottava soprani||XIX||Uccelliera|
|Flauto in selva bassi (dal Do2)||XXII||Rollo|
|Flauto in selva soprani||XXVI e XXIX|
|Corni dolci Soprani||Cornetto Soprani|
|Viola Bassi||Cornettino Nasardo Soprani|
|Ottavino Bassi||Trombe Basse|
|Fagioletto soprani||Trombe soprani|
Only the Principale is really full of the first chromatic notes while for all other stops the first octave is made chromatic by connecting the keys C#, D#, F# and G# to the higher octave.
The instrument was restored in 1992 by the organ workshop Alessandro Corno and sons.